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Qubit Metrology of Ultralow Phase Noise Using Randomized Benchmarking

P. J. J. O’Malley1, J. Kelly1,*, R. Barends1,*, B. Campbell1, Y. Chen1,*, Z. Chen1, B. Chiaro1, A. Dunsworth1, A. G. Fowler1,2,* et al.

I.-C. Hoi1, E. Jeffrey1,*, A. Megrant1,3, J. Mutus1,*, C. Neill1, C. Quintana1, P. Roushan1,*, D. Sank1,*, A. Vainsencher1, J. Wenner1, T. C. White1, A. N. Korotkov4, A. N. Cleland1, and John M. Martinis1,*

  • 1Department of Physics, University of California, Santa Barbara, California 93106, USA
  • 2Centre for Quantum Computation and Communication Technology, School of Physics, The University of Melbourne, Victoria 3010, Australia
  • 3Department of Materials, University of California, Santa Barbara, California 93106, USA
  • 4Department of Electrical and Computer Engineering, University of California, Riverside, California 92521, USA

  • *Present address: Google Inc., Santa Barbara, California 93117, USA.
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Phys. Rev. Applied 3, 044009 – Published 17 April, 2015

DOI: https://doi.org/10.1103/PhysRevApplied.3.044009

Abstract

A precise measurement of dephasing over a range of time scales is critical for improving quantum gates beyond the error correction threshold. We present a metrological tool based on randomized benchmarking capable of greatly increasing the precision of Ramsey and spin-echo sequences by the repeated but incoherent addition of phase noise. We find our superconducting-quantum-interference-device-based qubit is not limited by 1/f flux noise at short time scales but instead observe a telegraph noise mechanism that is not amenable to study with standard measurement techniques.

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Phys. Rev. Applied 3, 044009– Published 17 April, 2015
  • Received 30 October 2014

© 2015 American Physical Society

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